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178 lines
4.6 KiB
178 lines
4.6 KiB
4 months ago
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import { inspect } from '../jsutils/inspect.mjs';
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import { invariant } from '../jsutils/invariant.mjs';
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import { isIterableObject } from '../jsutils/isIterableObject.mjs';
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import { isObjectLike } from '../jsutils/isObjectLike.mjs';
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import { Kind } from '../language/kinds.mjs';
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import {
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isEnumType,
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isInputObjectType,
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isLeafType,
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isListType,
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isNonNullType,
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} from '../type/definition.mjs';
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import { GraphQLID } from '../type/scalars.mjs';
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/**
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* Produces a GraphQL Value AST given a JavaScript object.
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* Function will match JavaScript/JSON values to GraphQL AST schema format
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* by using suggested GraphQLInputType. For example:
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*
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* astFromValue("value", GraphQLString)
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*
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* A GraphQL type must be provided, which will be used to interpret different
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* JavaScript values.
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*
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* | JSON Value | GraphQL Value |
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* | ------------- | -------------------- |
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* | Object | Input Object |
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* | Array | List |
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* | Boolean | Boolean |
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* | String | String / Enum Value |
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* | Number | Int / Float |
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* | Unknown | Enum Value |
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* | null | NullValue |
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*
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*/
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export function astFromValue(value, type) {
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if (isNonNullType(type)) {
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const astValue = astFromValue(value, type.ofType);
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if (
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(astValue === null || astValue === void 0 ? void 0 : astValue.kind) ===
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Kind.NULL
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) {
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return null;
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}
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return astValue;
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} // only explicit null, not undefined, NaN
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if (value === null) {
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return {
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kind: Kind.NULL,
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};
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} // undefined
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if (value === undefined) {
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return null;
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} // Convert JavaScript array to GraphQL list. If the GraphQLType is a list, but
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// the value is not an array, convert the value using the list's item type.
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if (isListType(type)) {
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const itemType = type.ofType;
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if (isIterableObject(value)) {
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const valuesNodes = [];
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for (const item of value) {
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const itemNode = astFromValue(item, itemType);
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if (itemNode != null) {
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valuesNodes.push(itemNode);
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}
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}
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return {
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kind: Kind.LIST,
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values: valuesNodes,
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};
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}
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return astFromValue(value, itemType);
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} // Populate the fields of the input object by creating ASTs from each value
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// in the JavaScript object according to the fields in the input type.
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if (isInputObjectType(type)) {
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if (!isObjectLike(value)) {
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return null;
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}
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const fieldNodes = [];
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for (const field of Object.values(type.getFields())) {
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const fieldValue = astFromValue(value[field.name], field.type);
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if (fieldValue) {
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fieldNodes.push({
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kind: Kind.OBJECT_FIELD,
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name: {
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kind: Kind.NAME,
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value: field.name,
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},
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value: fieldValue,
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});
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}
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}
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return {
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kind: Kind.OBJECT,
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fields: fieldNodes,
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};
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}
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if (isLeafType(type)) {
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// Since value is an internally represented value, it must be serialized
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// to an externally represented value before converting into an AST.
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const serialized = type.serialize(value);
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if (serialized == null) {
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return null;
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} // Others serialize based on their corresponding JavaScript scalar types.
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if (typeof serialized === 'boolean') {
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return {
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kind: Kind.BOOLEAN,
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value: serialized,
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};
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} // JavaScript numbers can be Int or Float values.
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if (typeof serialized === 'number' && Number.isFinite(serialized)) {
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const stringNum = String(serialized);
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return integerStringRegExp.test(stringNum)
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? {
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kind: Kind.INT,
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value: stringNum,
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}
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: {
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kind: Kind.FLOAT,
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value: stringNum,
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};
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}
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if (typeof serialized === 'string') {
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// Enum types use Enum literals.
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if (isEnumType(type)) {
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return {
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kind: Kind.ENUM,
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value: serialized,
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};
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} // ID types can use Int literals.
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if (type === GraphQLID && integerStringRegExp.test(serialized)) {
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return {
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kind: Kind.INT,
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value: serialized,
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};
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}
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return {
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kind: Kind.STRING,
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value: serialized,
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};
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}
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throw new TypeError(`Cannot convert value to AST: ${inspect(serialized)}.`);
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}
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/* c8 ignore next 3 */
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// Not reachable, all possible types have been considered.
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false || invariant(false, 'Unexpected input type: ' + inspect(type));
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}
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/**
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* IntValue:
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* - NegativeSign? 0
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* - NegativeSign? NonZeroDigit ( Digit+ )?
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*/
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const integerStringRegExp = /^-?(?:0|[1-9][0-9]*)$/;
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